Brimbank Park: Adaptive Nature of the Natural Environment in a Growing Urban Area
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Brimbank Park (coordinates 37.7340° S, 144.8370° E) is located in the Maribyrnong Valley (hollowed by the Maribyrnong River), near the Melbourne suburb Keilor. It is intersected by the Maribynong River and the M80 highway, which reveals the adaptive nature of the natural environment in a growing urban area. (Parks Victoria, 2013)
Figure 1: Map of Brimbank Park (Google Maps, 2014)
Brimbank Park consists mainly of sedimentary rock, due to its close proximity to the Maribyrnong River. Along the banks, alluvial deposits and terrace sediments arise from the Quaternary Period (Geological map of Victoria, 1973). Although there is a distinct lack of igneous rock in area, the sediments from primary igneous rock upstream have weathered and been carried downstream onto the river banks. This process has been accelerated due to the water in the ecosystem.
Sedimentary rock from the older Silurian Period is further from the river banks (Geological map of Victoria, 1973). Mudstone, inter-bedded shale and greywacke depositions indicate the Maribyrnong River may have previously taken a different shape, and younger sediments have replaced the older sediments in more recent geological periods.
The third alluvial deposition consists of sand, silt and minor inter-bedded gravel, and again indicates Brimbank Park’s changing geology over time. (Geological map of Victoria, 1973). These deposits, as well as a nearby fault suggest volcanic activity 5-1.6 million years ago, which explains the olivine basalt (fig. 2) deposits which date back to to the Silurian and Tertiary period.
Figure 2: Olivine basalt (Uncyclomedia commons. (2006))
Figure 3: Geology of Brimbank Park (Department of Primary Industries, 2012)
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Frogs of Australia. (n.d) Growling Grass Frog. Retrieved from:
Brimbank City Council (2012) Brimbank Biodiversity Strategy 2012-2022 Retrieved:
http://mapshare2.dse.vic.gov.au/output/map30948.pdf acessed 06/04/14
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